Life support system knife



FIG. 1 is a perspective view of a life support system knife showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a right hand end elevational view of the knife of FIG. 1;

FIG. 4 is a top plan view of the knife of FIG. 1; and

FIG. 5 is a bottom plan view of the knife of FIG. 1. 

The ornamental design for a life support system knife, as shown. 